I'm reading a good book about food: The Omnivore's Dilemma by Michael Pollan. It's very informative. I had a fairly good understanding of the vagaries of industrial cattle, pig, and chicken farming, which is why I try to buy local meat from the farmers' market, but I had no idea about industrial corn farming! Pollan basically calls us fritos on legs because of our large consumption of processed corn.
My other favorite food book is Salt: A History of the World by Mark Kurlansky. It might actually be the only book our dipwad head of state has read in eight years, but don't let that deter you.